4b6a7bddad
This is because calls with M_WAIT (now M_TRYWAIT) may not wait forever when nothing is available for allocation, and may end up returning NULL. Hopefully we now communicate more of the right thing to developers and make it very clear that it's necessary to check whether calls with M_(TRY)WAIT also resulted in a failed allocation. M_TRYWAIT basically means "try harder, block if necessary, but don't necessarily wait forever." The time spent blocking is tunable with the kern.ipc.mbuf_wait sysctl. M_WAIT is now deprecated but still defined for the next little while. * Fix a typo in a comment in mbuf.h * Fix some code that was actually passing the mbuf subsystem's M_WAIT to malloc(). Made it pass M_WAITOK instead. If we were ever to redefine the value of the M_WAIT flag, this could have became a big problem.
662 lines
15 KiB
C
662 lines
15 KiB
C
/*
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* Copyright (c) 1982, 1986, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)raw_ip.c 8.7 (Berkeley) 5/15/95
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* $FreeBSD$
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*/
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#include "opt_inet6.h"
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#include "opt_ipsec.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <vm/vm_zone.h>
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#include <net/if.h>
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#include <net/route.h>
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#define _IP_VHL
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/in_pcb.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_mroute.h>
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#include <netinet/ip_fw.h>
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#ifdef IPSEC
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#include <netinet6/ipsec.h>
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#endif /*IPSEC*/
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#include "opt_ipdn.h"
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#ifdef DUMMYNET
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#include <netinet/ip_dummynet.h>
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#endif
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struct inpcbhead ripcb;
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struct inpcbinfo ripcbinfo;
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/*
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* Nominal space allocated to a raw ip socket.
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*/
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#define RIPSNDQ 8192
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#define RIPRCVQ 8192
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/*
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* Raw interface to IP protocol.
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*/
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/*
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* Initialize raw connection block q.
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*/
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void
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rip_init()
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{
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LIST_INIT(&ripcb);
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ripcbinfo.listhead = &ripcb;
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/*
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* XXX We don't use the hash list for raw IP, but it's easier
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* to allocate a one entry hash list than it is to check all
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* over the place for hashbase == NULL.
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*/
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ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask);
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ripcbinfo.porthashbase = hashinit(1, M_PCB, &ripcbinfo.porthashmask);
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ripcbinfo.ipi_zone = zinit("ripcb", sizeof(struct inpcb),
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maxsockets, ZONE_INTERRUPT, 0);
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}
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static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
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/*
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* Setup generic address and protocol structures
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* for raw_input routine, then pass them along with
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* mbuf chain.
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*/
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void
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rip_input(m, off, proto)
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struct mbuf *m;
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int off, proto;
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{
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register struct ip *ip = mtod(m, struct ip *);
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register struct inpcb *inp;
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struct inpcb *last = 0;
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struct mbuf *opts = 0;
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ripsrc.sin_addr = ip->ip_src;
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LIST_FOREACH(inp, &ripcb, inp_list) {
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#ifdef INET6
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if ((inp->inp_vflag & INP_IPV4) == 0)
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continue;
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#endif
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if (inp->inp_ip_p && inp->inp_ip_p != proto)
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continue;
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if (inp->inp_laddr.s_addr &&
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inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
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continue;
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if (inp->inp_faddr.s_addr &&
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inp->inp_faddr.s_addr != ip->ip_src.s_addr)
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continue;
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if (last) {
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struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
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if (n) {
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if (last->inp_flags & INP_CONTROLOPTS ||
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last->inp_socket->so_options & SO_TIMESTAMP)
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ip_savecontrol(last, &opts, ip, n);
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if (sbappendaddr(&last->inp_socket->so_rcv,
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(struct sockaddr *)&ripsrc, n,
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opts) == 0) {
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/* should notify about lost packet */
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m_freem(n);
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if (opts)
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m_freem(opts);
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} else
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sorwakeup(last->inp_socket);
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opts = 0;
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}
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}
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last = inp;
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}
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if (last) {
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if (last->inp_flags & INP_CONTROLOPTS ||
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last->inp_socket->so_options & SO_TIMESTAMP)
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ip_savecontrol(last, &opts, ip, m);
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if (sbappendaddr(&last->inp_socket->so_rcv,
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(struct sockaddr *)&ripsrc, m, opts) == 0) {
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m_freem(m);
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if (opts)
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m_freem(opts);
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} else
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sorwakeup(last->inp_socket);
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} else {
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m_freem(m);
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ipstat.ips_noproto++;
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ipstat.ips_delivered--;
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}
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}
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/*
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* Generate IP header and pass packet to ip_output.
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* Tack on options user may have setup with control call.
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*/
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int
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rip_output(m, so, dst)
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struct mbuf *m;
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struct socket *so;
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u_long dst;
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{
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register struct ip *ip;
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register struct inpcb *inp = sotoinpcb(so);
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int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
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/*
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* If the user handed us a complete IP packet, use it.
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* Otherwise, allocate an mbuf for a header and fill it in.
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*/
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if ((inp->inp_flags & INP_HDRINCL) == 0) {
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if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
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m_freem(m);
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return(EMSGSIZE);
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}
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M_PREPEND(m, sizeof(struct ip), M_TRYWAIT);
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ip = mtod(m, struct ip *);
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ip->ip_tos = 0;
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ip->ip_off = 0;
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ip->ip_p = inp->inp_ip_p;
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ip->ip_len = m->m_pkthdr.len;
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ip->ip_src = inp->inp_laddr;
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ip->ip_dst.s_addr = dst;
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ip->ip_ttl = MAXTTL;
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} else {
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if (m->m_pkthdr.len > IP_MAXPACKET) {
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m_freem(m);
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return(EMSGSIZE);
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}
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ip = mtod(m, struct ip *);
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/* don't allow both user specified and setsockopt options,
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and don't allow packet length sizes that will crash */
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if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2))
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&& inp->inp_options)
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|| (ip->ip_len > m->m_pkthdr.len)
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|| (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) {
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m_freem(m);
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return EINVAL;
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}
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if (ip->ip_id == 0)
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ip->ip_id = htons(ip_id++);
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/* XXX prevent ip_output from overwriting header fields */
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flags |= IP_RAWOUTPUT;
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ipstat.ips_rawout++;
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}
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#ifdef IPSEC
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ipsec_setsocket(m, so);
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#endif /*IPSEC*/
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return (ip_output(m, inp->inp_options, &inp->inp_route, flags,
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inp->inp_moptions));
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}
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/*
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* Raw IP socket option processing.
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*/
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int
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rip_ctloutput(so, sopt)
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struct socket *so;
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struct sockopt *sopt;
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{
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struct inpcb *inp = sotoinpcb(so);
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int error, optval;
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if (sopt->sopt_level != IPPROTO_IP)
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return (EINVAL);
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error = 0;
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switch (sopt->sopt_dir) {
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case SOPT_GET:
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switch (sopt->sopt_name) {
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case IP_HDRINCL:
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optval = inp->inp_flags & INP_HDRINCL;
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error = sooptcopyout(sopt, &optval, sizeof optval);
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break;
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case IP_FW_ADD:
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case IP_FW_GET:
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if (ip_fw_ctl_ptr == 0)
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error = ENOPROTOOPT;
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else
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error = ip_fw_ctl_ptr(sopt);
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break;
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#ifdef DUMMYNET
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case IP_DUMMYNET_GET:
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if (ip_dn_ctl_ptr == NULL)
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error = ENOPROTOOPT ;
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else
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error = ip_dn_ctl_ptr(sopt);
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break ;
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#endif /* DUMMYNET */
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case MRT_INIT:
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case MRT_DONE:
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case MRT_ADD_VIF:
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case MRT_DEL_VIF:
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case MRT_ADD_MFC:
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case MRT_DEL_MFC:
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case MRT_VERSION:
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case MRT_ASSERT:
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error = ip_mrouter_get(so, sopt);
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break;
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default:
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error = ip_ctloutput(so, sopt);
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break;
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}
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break;
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case SOPT_SET:
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switch (sopt->sopt_name) {
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case IP_HDRINCL:
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error = sooptcopyin(sopt, &optval, sizeof optval,
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sizeof optval);
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if (error)
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break;
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if (optval)
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inp->inp_flags |= INP_HDRINCL;
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else
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inp->inp_flags &= ~INP_HDRINCL;
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break;
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case IP_FW_ADD:
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case IP_FW_DEL:
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case IP_FW_FLUSH:
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case IP_FW_ZERO:
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case IP_FW_RESETLOG:
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if (ip_fw_ctl_ptr == 0)
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error = ENOPROTOOPT;
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else
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error = ip_fw_ctl_ptr(sopt);
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break;
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#ifdef DUMMYNET
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case IP_DUMMYNET_CONFIGURE:
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case IP_DUMMYNET_DEL:
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case IP_DUMMYNET_FLUSH:
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if (ip_dn_ctl_ptr == NULL)
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error = ENOPROTOOPT ;
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else
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error = ip_dn_ctl_ptr(sopt);
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break ;
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#endif
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case IP_RSVP_ON:
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error = ip_rsvp_init(so);
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break;
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case IP_RSVP_OFF:
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error = ip_rsvp_done();
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break;
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/* XXX - should be combined */
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case IP_RSVP_VIF_ON:
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error = ip_rsvp_vif_init(so, sopt);
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break;
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case IP_RSVP_VIF_OFF:
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error = ip_rsvp_vif_done(so, sopt);
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break;
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case MRT_INIT:
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case MRT_DONE:
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case MRT_ADD_VIF:
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case MRT_DEL_VIF:
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case MRT_ADD_MFC:
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case MRT_DEL_MFC:
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case MRT_VERSION:
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case MRT_ASSERT:
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error = ip_mrouter_set(so, sopt);
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break;
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default:
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error = ip_ctloutput(so, sopt);
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break;
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}
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break;
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}
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return (error);
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}
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/*
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* This function exists solely to receive the PRC_IFDOWN messages which
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* are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa,
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* and calls in_ifadown() to remove all routes corresponding to that address.
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* It also receives the PRC_IFUP messages from if_up() and reinstalls the
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* interface routes.
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*/
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void
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rip_ctlinput(cmd, sa, vip)
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int cmd;
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struct sockaddr *sa;
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void *vip;
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{
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struct in_ifaddr *ia;
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struct ifnet *ifp;
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int err;
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int flags;
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switch (cmd) {
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case PRC_IFDOWN:
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for (ia = in_ifaddrhead.tqh_first; ia;
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ia = ia->ia_link.tqe_next) {
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if (ia->ia_ifa.ifa_addr == sa
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&& (ia->ia_flags & IFA_ROUTE)) {
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/*
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* in_ifscrub kills the interface route.
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*/
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in_ifscrub(ia->ia_ifp, ia);
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/*
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* in_ifadown gets rid of all the rest of
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* the routes. This is not quite the right
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* thing to do, but at least if we are running
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* a routing process they will come back.
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*/
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in_ifadown(&ia->ia_ifa);
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break;
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}
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}
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break;
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case PRC_IFUP:
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for (ia = in_ifaddrhead.tqh_first; ia;
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ia = ia->ia_link.tqe_next) {
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if (ia->ia_ifa.ifa_addr == sa)
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break;
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}
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if (ia == 0 || (ia->ia_flags & IFA_ROUTE))
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return;
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flags = RTF_UP;
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ifp = ia->ia_ifa.ifa_ifp;
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if ((ifp->if_flags & IFF_LOOPBACK)
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|| (ifp->if_flags & IFF_POINTOPOINT))
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flags |= RTF_HOST;
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err = rtinit(&ia->ia_ifa, RTM_ADD, flags);
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if (err == 0)
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ia->ia_flags |= IFA_ROUTE;
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break;
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}
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}
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u_long rip_sendspace = RIPSNDQ;
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u_long rip_recvspace = RIPRCVQ;
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SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
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&rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
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SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
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&rip_recvspace, 0, "Maximum incoming raw IP datagram size");
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static int
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rip_attach(struct socket *so, int proto, struct proc *p)
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{
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struct inpcb *inp;
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int error, s;
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inp = sotoinpcb(so);
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if (inp)
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panic("rip_attach");
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if (p && (error = suser(p)) != 0)
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return error;
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error = soreserve(so, rip_sendspace, rip_recvspace);
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if (error)
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return error;
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s = splnet();
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error = in_pcballoc(so, &ripcbinfo, p);
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splx(s);
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if (error)
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return error;
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inp = (struct inpcb *)so->so_pcb;
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inp->inp_vflag |= INP_IPV4;
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inp->inp_ip_p = proto;
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#ifdef IPSEC
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error = ipsec_init_policy(so, &inp->inp_sp);
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if (error != 0) {
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in_pcbdetach(inp);
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return error;
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}
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#endif /*IPSEC*/
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return 0;
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}
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static int
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rip_detach(struct socket *so)
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{
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struct inpcb *inp;
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inp = sotoinpcb(so);
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if (inp == 0)
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panic("rip_detach");
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if (so == ip_mrouter)
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ip_mrouter_done();
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ip_rsvp_force_done(so);
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if (so == ip_rsvpd)
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ip_rsvp_done();
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in_pcbdetach(inp);
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return 0;
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}
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static int
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rip_abort(struct socket *so)
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{
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soisdisconnected(so);
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return rip_detach(so);
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}
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static int
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rip_disconnect(struct socket *so)
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{
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if ((so->so_state & SS_ISCONNECTED) == 0)
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return ENOTCONN;
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return rip_abort(so);
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}
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static int
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rip_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
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{
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struct inpcb *inp = sotoinpcb(so);
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struct sockaddr_in *addr = (struct sockaddr_in *)nam;
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if (nam->sa_len != sizeof(*addr))
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return EINVAL;
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|
|
if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) &&
|
|
(addr->sin_family != AF_IMPLINK)) ||
|
|
(addr->sin_addr.s_addr &&
|
|
ifa_ifwithaddr((struct sockaddr *)addr) == 0))
|
|
return EADDRNOTAVAIL;
|
|
inp->inp_laddr = addr->sin_addr;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
rip_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
|
|
{
|
|
struct inpcb *inp = sotoinpcb(so);
|
|
struct sockaddr_in *addr = (struct sockaddr_in *)nam;
|
|
|
|
if (nam->sa_len != sizeof(*addr))
|
|
return EINVAL;
|
|
if (TAILQ_EMPTY(&ifnet))
|
|
return EADDRNOTAVAIL;
|
|
if ((addr->sin_family != AF_INET) &&
|
|
(addr->sin_family != AF_IMPLINK))
|
|
return EAFNOSUPPORT;
|
|
inp->inp_faddr = addr->sin_addr;
|
|
soisconnected(so);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
rip_shutdown(struct socket *so)
|
|
{
|
|
socantsendmore(so);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
|
|
struct mbuf *control, struct proc *p)
|
|
{
|
|
struct inpcb *inp = sotoinpcb(so);
|
|
register u_long dst;
|
|
|
|
if (so->so_state & SS_ISCONNECTED) {
|
|
if (nam) {
|
|
m_freem(m);
|
|
return EISCONN;
|
|
}
|
|
dst = inp->inp_faddr.s_addr;
|
|
} else {
|
|
if (nam == NULL) {
|
|
m_freem(m);
|
|
return ENOTCONN;
|
|
}
|
|
dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr;
|
|
}
|
|
return rip_output(m, so, dst);
|
|
}
|
|
|
|
static int
|
|
rip_pcblist(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, i, n, s;
|
|
struct inpcb *inp, **inp_list;
|
|
inp_gen_t gencnt;
|
|
struct xinpgen xig;
|
|
|
|
/*
|
|
* The process of preparing the TCB list is too time-consuming and
|
|
* resource-intensive to repeat twice on every request.
|
|
*/
|
|
if (req->oldptr == 0) {
|
|
n = ripcbinfo.ipi_count;
|
|
req->oldidx = 2 * (sizeof xig)
|
|
+ (n + n/8) * sizeof(struct xinpcb);
|
|
return 0;
|
|
}
|
|
|
|
if (req->newptr != 0)
|
|
return EPERM;
|
|
|
|
/*
|
|
* OK, now we're committed to doing something.
|
|
*/
|
|
s = splnet();
|
|
gencnt = ripcbinfo.ipi_gencnt;
|
|
n = ripcbinfo.ipi_count;
|
|
splx(s);
|
|
|
|
xig.xig_len = sizeof xig;
|
|
xig.xig_count = n;
|
|
xig.xig_gen = gencnt;
|
|
xig.xig_sogen = so_gencnt;
|
|
error = SYSCTL_OUT(req, &xig, sizeof xig);
|
|
if (error)
|
|
return error;
|
|
|
|
inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
|
|
if (inp_list == 0)
|
|
return ENOMEM;
|
|
|
|
s = splnet();
|
|
for (inp = ripcbinfo.listhead->lh_first, i = 0; inp && i < n;
|
|
inp = inp->inp_list.le_next) {
|
|
if (inp->inp_gencnt <= gencnt)
|
|
inp_list[i++] = inp;
|
|
}
|
|
splx(s);
|
|
n = i;
|
|
|
|
error = 0;
|
|
for (i = 0; i < n; i++) {
|
|
inp = inp_list[i];
|
|
if (inp->inp_gencnt <= gencnt) {
|
|
struct xinpcb xi;
|
|
xi.xi_len = sizeof xi;
|
|
/* XXX should avoid extra copy */
|
|
bcopy(inp, &xi.xi_inp, sizeof *inp);
|
|
if (inp->inp_socket)
|
|
sotoxsocket(inp->inp_socket, &xi.xi_socket);
|
|
error = SYSCTL_OUT(req, &xi, sizeof xi);
|
|
}
|
|
}
|
|
if (!error) {
|
|
/*
|
|
* Give the user an updated idea of our state.
|
|
* If the generation differs from what we told
|
|
* her before, she knows that something happened
|
|
* while we were processing this request, and it
|
|
* might be necessary to retry.
|
|
*/
|
|
s = splnet();
|
|
xig.xig_gen = ripcbinfo.ipi_gencnt;
|
|
xig.xig_sogen = so_gencnt;
|
|
xig.xig_count = ripcbinfo.ipi_count;
|
|
splx(s);
|
|
error = SYSCTL_OUT(req, &xig, sizeof xig);
|
|
}
|
|
free(inp_list, M_TEMP);
|
|
return error;
|
|
}
|
|
|
|
SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0,
|
|
rip_pcblist, "S,xinpcb", "List of active raw IP sockets");
|
|
|
|
struct pr_usrreqs rip_usrreqs = {
|
|
rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect,
|
|
pru_connect2_notsupp, in_control, rip_detach, rip_disconnect,
|
|
pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp,
|
|
pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown,
|
|
in_setsockaddr, sosend, soreceive, sopoll
|
|
};
|